Roman libra = 0.3265865064 kilogram (mass)
Try converting from "librae" to arroba (Mexican arroba), assay ton, cental (British cental), cotton bale (US), doppelzentner, dram (avoirdupois dram), dram ap (apothecary dram), funt (Russian funt), long quarter, long ton (avoirdupois long ton), mite (English mite), pennyweight troy (troy pennyweight), picul (Chinese picul), pound troy (troy pound), proton mass (proton rest mass), quintal, Roman obolus, Roman talent, scruple (apothecary scruple), short ton, or any combination of units which equate to "mass" and represent mass.
librae = 1.97E+26 AMU (atomic mass unit), .02730686 arroba (Mexican arroba), 1 as (Roman as), .54 catty (Chinese catty), .00096 cotton bale Egypt, .8 funt (Russian funt), 456.52 Greek obolos, 23.16 Israeli shekel mass, .00642857 long hundredweight (avoirdupois long hundredweight), 10.5 oz ap (apothecary ounce), 10.5 oz troy (troy ounce), .0054 picul (Chinese picul), .01993908 pood (Russian pood), .72 pound, 574.69 Roman obolus, .008 Roman talent, .0288 short quarter, .00710059 Spanish quintal, .00642857 UK quintal2 (British quintal), .00285714 wey mass.
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